Lenze Drive Server Bus server S7 getting started Manuale Utente Scaricare il pdf (Pagina 53)

Busserv er S7

114 Busserver S7 DE/EN 1.0

6.5.7 Reading a parameter

FC4, network 3

UN “TriggerRead”

= “TriggerRead”

CALL FC 90 //data types

DrivePar_DB :=”S7-Parameter” //DB81

Count :=0 //decimal: 0-31

PB_Address :=”PB-Address” //B#16#9

R_W :=TRUE //FALSE or TRUE

Code :=”Code” //W#16#C, code 12

SubCode :=”Subcode” //B#16#0, Sub-code 0

W_Value :=”Value” //DINT oder L#xxx

Status :=”ReadStatus” //OUT, BYTE, status byte

R_Value :=”ReadValue” //OUT, DINT, value

Trigger :=”TriggerRead” //INOUT, BOOL

• The variable TriggerRead is always set to TR UE.

Once a parameter read request has been processed correctly, TriggerRead is automatically

reset to FALSE.

• FC90 and parameter R_W = TRUE are called to transmit a read request for a drive parameter.

• Data exchange with FB DRIVE (FB90) takes place via the da ta block S7-Parameter (DB81).

• Input parameters are the request number, PROFIBUS address, write/read request and the code

and sub-code to be read.

• Output parameters are the read value and the status byte.

• Set parameter R_W to FALSE to transmit a write request for a drive parameter.

Tip!

Detailed information about the parameters of FC90 can be found in cha pter 6.3.3. (^ 102)

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Lenze Drive Server Bus server S7 getting started Manuale Utente Pagina 53